Telegraphy.



PATENTED APR. 24, 1906.

S. F. JONES. TELBGRAPHY.

APPLICATION FILED NOV, 21, 1905.

om m %g: 6- 3 mboz O'NTTE STATES PATENT OFFICE.

S"ERNS F. JONES, OF NE YORK, N. Y., ASSIGNOR OF ONE-HALF TO POSTALTELEGRAPH-CABLE COMPANY. OF NEW YORK, N. Y., A

CORPORATION OF NEW YORK.

TELEGRAPHY.

Specification of Letters Patent.

Patented April 24, 1906.

TO (IN 10/1/0722 it may concern:

Be it known that I, STERNS F. JONES, a citizen of the United States,residing in the borough of Brooklyn, in the city of New York, county ofKings, State of New York, have made certain new and useful Improvementsin Telegraphy, of which the following is a specification.

This invention relates to that form of telegraphy in which short andrapid alternations of current are divided into groups of varying lengthand sequence according to a code under the control of a key orcircuit-changer.

The object of my invention is to strengthen the transmitted impulses andto strengthen the received impulses without changing the electromotiveforce or strength of current of the altcrnatirig-current generator.

To this end there is provided a separate or local circuit at eachstation containing a polarized receiving-relay in series with acondenser, the contact-points of a suitable transmitter, and the coilsof a transformer. In a branch of this circuit there is aconstantlyoperating generator yielding short and rapid alternations ofcurrent. The coil of the transformer in the local circuit is ininductive relation to a second coil in the main line, and the coil ofthe transformer in the local circuit is divided into two unequalsections, the smaller section being included in circuit with thealternating generator when the trans- :mitter is closed, and bothsections are included with the receiving-relay when thetransmitter-contact is open. It results from this that the current ofthe generator is stepped up onto the line, and the impulses received inthe line-coil are stepped up into the local circuit.

The accompanying drawing illustrates my invention.

at is a main telegraph-line connecting two separated stations. Includedin series with the circuit at each station is a condenser f. Theapparatus at one station is a duplicate of that at the other and isincluded in a compound local circuit.

1' is a polarized receiving-relay having a retracting-spring included inthe conductor 5 6 in series with the condenser c and the coils 0 (Z of atransformer. The coil 0 preferably has thrlee times the number of turnsgiven to the coi (Z.

9 is a generator yielding short and rapidlyrecurring alternations ofcurrent to the extent of two or thrce hundred per second. It is includedin a conductor 2 4, the conductor 4 being connected to the junctionbetween the coils c and (I. The conductor 2 is conncctcd to a fixedcontact 7 of an electromagnetic transmitter. The conductor 3 isconnected to the movable contact 8 of said transmitter. 0 is thevibrating lever of the electromagnetic transmitter. which is retractedby the spring a, operated by the electromagnet it under the control ofthe Morse key It, operating in the local circuit 10 ll with the localbattery 1. The second coil of the transformer i is included in the mainline and has twice the number of coils assigned to the coil (1. Thetransformer has both coils composed of wire of the same gage andresistance. If we assume the coil 1! to be unity, the coil i will berepresented by 2, and the coil c will be represented by 3, and the sumof coils c and (I as compared with coil '1'. will be in the proportionof two to one.

The operation of the apparatus is as follows: Upon closing the key 7cthe transmitter closes the contact 7 S and includes the generator 9 in abranch circuit with the coil d, including elements 9, 4, (Z, 3, 8, 7,and 2. The alternations during the closed period are stepped up onto theline in the proportion of one to two. W'hen the transmitter is open atthe points 7 8 to provide for receiving signals on the relay 1*, therelay '1' is included in the local circuit with both G(.).llStCi-l01lS cand (Z in series. The circuit includes the elements 5, c, c, (Z, 3, 8,0, 6, and 1'. The received impulses in the coil i are transformed intothe local circuit in the ratio of one to two, there being twice themunbcr of convolutions in the two sections c and (7 as compared with thecoil 1'. It results from this arrangement that impulses transmitted fromthe generator {1 are stepped up onto the line m, and impulses receivedfrom the circuit 771 are stepped up into the local circuit containingthe relay 1'.

What I claim, and desire to secure by Letters Patent, is-

1. The combination with a telegraplbline at each of two or morestations, of a transformer-coil in the main line, a local circuitcontaining a receiving-relay in series with a condenser, atransformer-coil and the contact points of a suitable transmitter; analternating-current generator in a branch of said circuit, one terminalof which branch is connected to said transformer-coil at a pointintermediate its ends, the other terminal of said branch and theterminals of said local circuit being connected to saidtransmittercontacts in such a manner that when said transmitter isclosed the alternating-current generator is included in circuit with onecoil of said transformer, and when said transmitter is open thereceiving-relay is included in circuit with both coils of saidtransformer.

2. The combination with a telegraph-line at each of two stations, of atransformer-coil in the main line, a local circuit including areceiving-relay, a transformer-coil and the contact-points of a suitabletransmitter, an alternating-current generator in a branch of saidcircuit having one terminal connected to said transformer-coil at anintermediate point, the other terminal and the terminals of the localcircuit being connected to transmittercontacts in such a manner thatwhen the transmitter is closed the generator is included in circuit withone coil of said transformer and when open the receiving-relay isincluded in circuit with both coils of said transformer.

3. A telegraph-line having means for transmitting and receivingcode-signals by varying the length and se uence of groups of alternatingimpulses wit a local circuit and a transformer at one station, saidtransformer having one coil in the main line and one coil in the localcircuit, the last-named coil divided into two unequal sections, thesmaller coil being in circuit with the transmitting generator.

4. The combination with a telegraph-line at each of two stations, ofsuitable alternating-current transmitting and receiving apparatus in alocal circuit and a transformer having three coils, including amain-line coil, a transmitting-coil, and a receiving-coil, and means forincluding the two last-named coils in circuit in series with thereceiving apparatus during the operation of receiving.

5. A telegraph-line having means for transmitting and receivingcode-signals by varying the length and se uence of groups of alternatingimpulses, it a local circuit and a transformer at one station, saidtransformer having three coils, one coil in the main line, atransmitting-coil and a receiving-coil, and means whereby thetransmitting-coil alone is included in circuit during the act oftransmitting.

6. A telegraph-line having means for transmitting and receivingcode-signals by varying the length and se uence of groups of alternatingimpulses, wit a local circuit and a transformer at one station, saidtransformer having three coils, one coil in the main line, atransmitting-coil, and a receiving-coil, and means whereby bothreceiving and transmitting coils are included in circuit in series with1 the receiving apparatus during the operation of receiving.

HENRY G. FRrTscHE, A. M. DONLEVY.

